PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/28-12:13:00
G07     331.8          57.5                4.1 +/-    1.39       4.7 +/-    1.39  0.040 / 0.020
G08     103.1          50.0               -6.4 +/-   15.52      -8.0 +/-   15.52  0.040 / 0.020
G09     191.9          77.0                4.6 +/-    0.43       4.7 +/-    0.43  0.030 / 0.040
G11     146.1          10.4               -1.8 +/-   15.18      -4.9 +/-   15.18  0.040 / 0.050
G16     45.3           11.9                4.1 +/-    2.84      11.0 +/-    2.84  0.140 / 0.160
G23     154.1          48.0                5.5 +/-    1.11       7.1 +/-    1.11  0.080 / 0.120
G27     58.6           32.9                5.0 +/-    1.51       8.2 +/-    1.51  0.050 / 0.040
G28     234.2          26.1              -25.6 +/-   59.83     -48.8 +/-   59.83  0.040 / 0.040
G30     297.1          30.1                4.1 +/-    1.82       7.2 +/-    1.82  0.090 / 0.090